Possible Cause
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
- Low DEF level in the tank.
- Frozen DEF in the line.
- DEF pressure line is kinked, broken, or disconnected.
- DEF supply pump assembly.
- Debris in the DEF tank.